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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58efd8804175e86ac4123d7ba422c10dde929b605c0188f48010eb1ced6e2645' 
  AND token = 'zaF4CLwi2aiB6k5l0b9w2oU97OfdfNHOpxx70khCdwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}